For the same reason(s) the common flu is more prevalent in the winter. Wikipedia has some proposed explanations: https://en.wikipedia.org/wiki/Flu_season#Cause

For the same reason(s) the common flu is more prevalent in the winter. Wikipedia has some proposed explanations: https://en.wikipedia.org/wiki/Flu_season#Cause https://en.wikipedia.org/wiki/Flu_season#Cause.